I have a problem trying to configure the sunix 4055A serial card.

After plugging the card, starting the computer and running kudzu, I get
the following results :
[root@c1.orika-demo root]# dmesg |grep ttyS
ttyS0 at 0x03f8 (irq = 4) is a 16550A
ttyS1 at 0x02f8 (irq = 3) is a 16550A
ttyS4 at port 0xe400 (irq = 12) is a 16550A
ttyS5 at port 0xe408 (irq = 12) is a 16550A
ttyS6 at port 0xe800 (irq = 12) is a 16550A
ttyS7 at port 0xe808 (irq = 12) is a 16550A

[root@c1.orika-demo root]# cat /proc/pci
PCI devices found:
Bus  0, device   0, function  0:
Host bridge: VIA Technologies, Inc. VT82C693A/694x [Apollo PRO133x]
(rev 196).
Master Capable.  Latency=8.
Prefetchable 32 bit memory at 0xe0000000 [0xe3ffffff].
Bus  0, device   1, function  0:
PCI bridge: VIA Technologies, Inc. VT82C598/694x [Apollo MVP3/Pro133x
AGP] (rev 0).
Master Capable.  No bursts.  Min Gnt=12.
Bus  0, device   7, function  0:
ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South] (rev
64).
Bus  0, device   7, function  1:
IDE interface: VIA Technologies, Inc. VT82C586B PIPC Bus Master IDE
(rev 6).      Master Capable.  Latency=32.
I/O at 0xd000 [0xd00f].
Bus  0, device   7, function  4:
Bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 64).
Bus  0, device  15, function  0:
Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 16).
IRQ 11.
Master Capable.  Latency=32.  Min Gnt=32.Max Lat=64.
I/O at 0xe000 [0xe0ff].
Non-prefetchable 32 bit memory at 0xe7000000 [0xe70000ff].
Bus  0, device  16, function  0:
Serial controller: Timedia Technology Co Ltd PCI2S550 (Dual 16550
UART) (rev 1).
IRQ 12.
I/O at 0xe400 [0xe41f].
I/O at 0xe800 [0xe80f].
Bus  1, device   0, function  0:
VGA compatible controller: ATI Technologies Inc Rage XL AGP 2X (rev 39).
IRQ 10.
Master Capable.  Latency=32.  Min Gnt=8.
Non-prefetchable 32 bit memory at 0xe4000000 [0xe4ffffff].
I/O at 0xc000 [0xc0ff].

I can write on /dev/ttyS4 and /dev/ttyS5 but for /dev/ttyS6 and
/dev/ttyS7 the results are any characters.

Ex:
echo "TEST" > /dev/ttyS4  give TEST on the device, the same for /dev/ttyS5
echo "TEST" > /dev/ttyS6 give ççççççççççççççç on the device, the same
for /dev/ttyS7

I use a RedHat  9.0  distribution with its provided kernel 2.4.20-31.9.
Do you have any idea ?

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